FUSES 

/ SICHERUNGEN

 PFMU

Resettable fuses 

www.schurter.com

11

Surface Mount
PTC-Fuses
Type PFMU

2,8 x 3,4 mm 
fast tripping
Packaged per EIA 481-1 

Agency recognition: 
UL, CSA, TÜV

 
 

Typical Time to Trip at 23 ˚C 

Fault current 

 (A)

Time to trip 

 

(s)

Dimensions 

 

Solder pad layouts 

Applications

• PC motherboards
• PC modems
• USB
• General electronics: Phones,

fax machines, televisions,
printers, video equipment,
PDA

Test Procedures And Requirements For Model PFMU Series 

Test 

/ Test

 

Test Conditions 

/ Bedingungen

 

Accept/Reject Criteria 

Visual/Mech. 

/ visuell/mech.

 

Verify dimensions and materials 

/ Kontrolle Abmess./Mat. 

Per MF physical description 

Resistance 

/ Widerstand

 

In still air @ 23 °C 

/ bei ruhiger Luft 23 °C

 R

min 

≤

 R 

≤

 R

max

Time to Trip 

/ Trip-Zeit

 

At specified current, V

max 

23 °C 

/ Bei entspr. Strom

 T 

≤

 max. 

time to trip 

/ Tr

(sec.

)

Hold Current 

/ Haltestrom

 

30 min. at I

hold 

/ bei Haltestrom

 

No trip 

Trip Cycle Life 

/ Trip-Zyklen

 

V

max

, I

max

, 100 cycles 

/ Zyklen

 

No arcing or burning 

Trip Endurance 

/ Zeit im Tripzustand

 

V

max

, 48 hours 

/ Stunden

 

No arcing or burning 

Environmental Characteristics 

Operating/Storage Temperature 

/ Einsatz/Lagertemp.

 -40 °C 

to 

+85 °C

Maximum Device Surface Temperature in Tripped State 

/

 

125 °C

Passive Aging 

/ passive Alterung

 +85 °C, 1000 

hours 

/ Std.

 ± 5% 

typ. resist. change 

Humidity Aging 

/ Feuchtigkeitsalterung 

+85 °C, 85% R.H. 1000 

hours 

/ Std.

± 10% 

typ. resist. change 

Thermal Shock 

/ Thermischer Schock

 +85 °C/–40 °C 20 

times 

/ Zyklen

 ± 10% 

typ. resist. change 

Solvent Resistance 

/ Lösungsmittel-Beständigkeit

 MIL-STD-202, Method 215 

No change 

Vibration 

MIL-STD-883C, Method 2007.1, 

No change 

Condition A 

Typical Part Marking 

Layout may vary 

Manufacturer’s
Trademark 

Part identification 

Date code week 1 of 2000 = 0A (year and week)
week 27 of 2000 = A0 (week and year)

50          75         100

1

0 1

10

100

10

1

0.01

0.001

0.1

0.1

1

10

PFMU.050.2

P

FM

U

.01

0.2

PFMU.005.2

PFMU.110.2

PFMU.075.2

1.1 ± 0.1
(.043 ± .004)

1.1 ± 0.1
(.043 ± .004)

1.1 ± 0.1
(.043 ± .004)

2.6 ± 0.1
(.102 ± .004)

Min.

A

C

B

D

1.7 ± 0.1
(.067 ± .004)

?

PFMU.035.2

PFMU.020.2

www.schurter.com

12

Type 

/ Typ

 I

max

V

max

I

hold

I

trip

Initial 

1 Hour (R1) Post-

Max. Time

Tripped Power

Resistance 

/

 

Reflow Resistance 

/

 

to trip at 23 °C/8A 

/

 Dissipation 

Amperes at 23 °C

 /

 Ohms at 23 °C Amperes 

/

 Seconds 

/

 Watts at 23 °C 

/

A

V

Hold

Trip

R

min. 

R

1 max. 

at 

/ bei

 

23 °C at 

/ bei 

23 °C

PFMU.005.2

10

30

0.05

0.15

2.80

50.0

0.25

1.5

0.8

PFMU.010.2

10

30

0.10

0.30

0.80

15.0

0.5

0.6

0.8

PFMU.020.2

10

30

0.20

0.40

0.40

5.0

8.0

0.2

0.8

PFMU.035.2

40

6

0.35

0.75

0.20

1.30

8.0

0.2

1.0

PFMU.050.2

40

13.2

0.50

1.00

0.18

0.90

8.0

0.1

1.0

PFMU.075.2

40

6

0.75

1.50

0.07

0.45

8.0

0.1

1.2

PFMU.110.2

40

6

1.10

2.20

0.05

0.21

8.0

0.1

1.2

Electrical Characteristics /

Elektrische Daten

Model 

/ Modell

 A

B

 C

D

min.

max.

min.

max.

min.

max.

min.

PFMU.005.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

PFMU.010.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

PFMU.020.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

PFMU.035.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

PFMU.050.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.093)

(0.110)

(0.015)

(0.024)

(0.012)

PFMU.075.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

PFMU.110.2

3.00

3.43

2.35

2.80

0.38

0.62

0.30

(0.118)

(0.135)

(0.092)

(0.110)

(0.015)

(0.025)

(0.012)

Dimensions 

Soldering Profile 

How To Order 

PF     MU  .xxx    .x

PTC-Fuse 

Style 

MU = 1210 Surface Mount Component

Hold Current, I

hold 

005-110 (0.05 A - 1.10 A)

Packaging 
Packaged per EIA 481-1 

2 = 

Tape and reel 

/ 

 

Note 
• PFMU models can be wave soldered and reworked.

Thermal Derating Chart-I

hold 

(Amps) 

Type 

/ Typ

 

Ambient Operating Temperature 

–40 ˚C

–20 ˚C

0 ˚C

23 ˚C

40 ˚C

50 ˚C

60 ˚C

70 ˚C

85 ˚C

PFMU.005.2

0.08

0.07

0.06

0.05

0.04

0.04

0.03

0.03

0.02

PFMU.010.2

0.16

0.14

0.12

0.10

0.08

0.07

0.06

0.05

0.04

PFMU.020.2

0.32

0.28

0.24

0.20

0.16

0.14

0.12

0.10

0.06

PFMU.035.2

0.47

0.45

0.40

0.35

0.33

0.28

0.24

0.21

0.18

PFMU.050.2

0.76

0.67

0.58

0.50

0.43

0.40

0.36

0.32

0.28

PFMU.075.2

1.00

0.97

0.86

0.75

0.64

0.59

0.54

0.48

0.40

PFMU.110.2

1.60

1.42

1.26

1.10

0.94

0.86

0.80

0.70

0.58

FUSES 

/ SICHERUNGEN

 PFMU

Resettable fuses 

Packaging: 3000 pcs. per reel 

/

Maximum Package Body Temperature (220 °C)

Melting Temperature of Solder (183 °C)

2 Minutes or More

Preheat

Flux Activation

Reflow

Cool

10° to 20 C
per Second

Less than
120 °C per
Second

300

250

200

150

100

50

0

0        30       60            100              150             200              250 

T

emperatu

re (°

 C) 

Time (Second) 

 (s)

Dimensions in mm/inches